What is TRAb?
marker for Graves' disease
TRAb are antibodies that stimulate the thyroid to overproduce hormones. It is the specific marker for Graves' disease - the most common cause of hyperthyroidism.
The test is used when low TSH and raised thyroid hormones are confirmed, to determine the cause.
Test facts
- Unit
- IE/L
- Sample
- Serum
- Fasting
- No fasting needed
- Turnaround
- 5 days
What does low TRAb mean?
Negative TRAb makes Graves' disease less likely.
What does high TRAb mean?
Positive TRAb strongly suggests Graves' disease.
Panels that measure TRAb
- Thyroid + Autoimmune
More markers in the same area
Launching in Stockholm in 2026.
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This is general information about the marker, not an assessment of your values and not medical advice. Last updated: May 2026.